A Biocompatible Fluorescent Ink Based on Water‐Soluble Luminescent Carbon Nanodots

Abstract

C‐Punkte zur Hand: Biokompatible lumineszierende Kohlenstoffnanopunkte mit geringer Toxizität und charakteristischer Photolumineszenz wurden synthetisiert. Diese „C‐Punkte“ könnten sich für vielfältige Anwendungen eignen, z. B. als Fälschungssicherung sowie zur Verschlüsselung oder Speicherung von Informationen.

Synthesis of Fluorescence Carbon Nanoparticles from Ascorbic Acid

“…1a. Percent yield of C-dot from ascorbic acid was 60%, this is similar to the yield from citric acid reported by Qu et al [2]. The synthesized C-dots were highly soluble in the water (Fig.…”

“…A solution was made by diluting 1 g of ascorbic acid and 1 g of urea in 10 mL of deionized water, which was then carbonized by heating in a microwave oven for 4 min [2]. During heating, the color of solution changed from colorless to brown, and eventually a brownish black solid phase precipitated from the solution.…”

“…C-dots have similar characteristics with heavy metal based quantum dots but have a number of advantages such as good solubility in water, cheap starting materials, do not contain heavy metals, efficient synthetic process, having strong photoluminescence properties, low toxicity, and good photostability [3]. These materials are widely used as photocatalysts, sensors, lasers, LED, and tools for converting or storing energy [2,4]. C-dots can be synthesized from any starting materials that contain carbon atoms, and different sources of starting material will give different fluorescence.…”

“…These materials are analogous to quantum dots and have structural similarity with graphite oxide particles [2]. C-dots have similar characteristics with heavy metal based quantum dots but have a number of advantages such as good solubility in water, cheap starting materials, do not contain heavy metals, efficient synthetic process, having strong photoluminescence properties, low toxicity, and good photostability [3].…”

“…C-dots can be synthesized from any starting materials that contain carbon atoms, and different sources of starting material will give different fluorescence. C-dots have been synthesized from citric acid [2], candle soot [5], soy milk [4], egg white and egg yolk [6], gum arabic [7], orange peel 8], and various amino acids [9]. Hsu et al [10] observed that functional groups of carboxylic acid and hydroxylate on the starting material of organic compounds are very important in the synthesized of C-dot.…”